Pitman-tightening device



C. R. GRINER. PITMAN TIGHTENING DEVICE. APPLICATION FILED SEPT. I. 1920.

Patented Oct. 4, 1921.

,Y ATTORNEY.

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Application led September 1, 1920.

To all whom 'it may concern:

Be it known that I, CLARENCE R. GRINER, a citizen of the United States, residing at Bowling Green, in the county of Wood and State of Ohio, have invented certain new and useful Improvements in Pitman-Tightening Devices; and I do` hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to a pitman tightenn ing device, designed especially for use in connection with an apparatus for oil wells.

The object is to provide eective means for clamping the pitman and follower, such means including a key extending transversely through the pitman and the follower, and means for locking the key in position.

A further object is to provide, in connection with the construction above outlined, a locking device which shall include a lever mounted at a point adjacent to the key when the latter is in operative position, this lever including aV cam element-for engaging theV edge portion of the key, and producing a clamping action with reference thereto.

With the foregoing'and other objects in view, the invention consists in the novel construction, combination and arrangement of elements hereinafter described and claimed.

In the accompanying` drawing:

Figure 1 is a perspective view, showing the key inserted, and showing the lever in position to be thrown for effecting the locking operation.

Fig. 2 is a similar view showing the lever in locked position.

Fig. 3 is a transverse section through the pitman and follower, the section being longitudinally of the key.

Fig. 4 is a transverse sectional view through the pitman showing its connection to a crank pin.

The pitman 10 is provided with a slot 11 extending lengthwise thereof and with slots 12 and 13 extending in a transverse direction with reference to the slot rst named. These slots 12 and 13 are for the insertion of a key 14, this key being tapered in themanner shown, and one end thereof being connected with a flexible element such as a wire 16 which is in turn connected with a spring 17 secured at the point 18.

The slot 11 of the pitman is, as illustrated in Figs.. 2 and 4, provided for the reception .Specification of Letters Patent.

.Patented 4,1921.

serial No. 407,463.

of a crank pin 20. A follower 20, which is positioned in the slot 11 of the pitman,bears as illustrated in Fig. 2, on the crank pin 20', and it is provided with a transverse slot 21, proportioned for engagement by the key. rihis key when passed transversely through the pitman and follower is engaged by a pin 23 passing through an aperture 24 in the end of the key and also passing through staples 25 located as shown.

rlhe clamping lever 23 is suitably mounted for swinging movement, on the side of the pitman. In order to effect this mounting, I provide a plurality of bars or straps 29 and 30having looped portions 31 and 32, these bars or straps being firmly secured to the side portion of the pitman, and the loops providing for the swinging movement of the off-set end of the lever.

While I do not limit myself to the exact form or construction of the lever, in the drawing I have shown this element as including a handle 31', an oset end portion 32', and a cam element 33 formed by deiecting the end of the olf-set member. The cam element is provided with a rounded surface 36 for engagement with the edge portion of the key, and the lever when swung to operative position, as shown in Fig. 2, firmly secures the key, and therefore effects positive engagement between the pitman and follower.

Owing to the simplicity and the substantial nature of the construction, it is practically impossible for trouble to arise through the failure of this device, or any part thereof to operate in the manner intended.

Having thus described the invention, what I claim is l. rllhe combination with a pitman and follower, each provided with a transverse slot, of a key extending through the afore said slots, and clamping means for retaining the key in position, said clamping means comprising a lever having a cam element projecting therefrom, and means for so mounting the lever as to permit its cam portion to engage said key.

2. The combination with a pitman and follower, of a key for connecting them, and means for clamping the key, the clamping means including a lever swingingly mounted at a point adjacent to the key when in operative position, an offeset portion on said lever and constituting a mounting element therefor, and a cam formed on the o-set portion and adapted for engagement with the key. v

3. The combination with e pitmen and follower', of a key 'for effecting engagement between them, and a clamping' device for engagement with the key for retaining the latter in locking position, said clamping element including :L lever, an oit-set portion thereon, a cam having e rounded surface and constituting` a deiiected portion of the Off-set element, and means for retaining the off-set element in e position to permit the swinging` movement of the lever.

4. The combination with e pitmen and `follower, each provided with a, transverse slot, of a key extending through the slots,

means passing' transversely through the end of the key and'engaging one side of the pitman, and e clamping device mounted on the other side of said pitman and positioned for engaging the edge portion of the key, said clamping` device including a lever, en offset portion thereon and deeoted to provide a cem, and strepsseoured to the hitman and provided with looped portions in which the olf-set portion of the lever is pivoted.

ln testimony whereof I affix' my signature in presence of a witness. 1

CLARENCE R. GRINER.

llitness: Y

BENNETT S. JONES. 

